Printing cylinder



July 14, 1925. 1,545,791

M. owapl PRINTING CYLINDER led March 28. 1925 Patented July 14, 1925.

"uNrreo-srArES Marcom OWEN; 0F Lernort, ENGf1f1ar-i2s.l

`ArENr rRrIN'rrNe cgtmnna application andVI tramaas,` 1192534 smania. 19,133.,

inders,l of `which 4the following is a specification. vi This invention relatesito printingf'cylinders of the kind' having a gap infwhlich ythe ends of the printing'sheet are fastened.

In' fitting 4prin-tingsheets to such cy-li7n ders, one end of the sheet (hereafter'referred to as the leading endw) `is anchored inthe gap; the sheet is lthen wrapped arerund the cylinder? and then the other end ofthe sheet thereafter referred to, as the free endn). is secured within the gap. A cylinder on which a vsheet is fastened this manner is described i inpatent specification Noe-1,506,859; i The ends offthe sheet having been fastened'wi'thin the gap of the cylinder, a capping piece is disposed Vover the gap to cover `the securingmeans, and if of the'nature described in the saidprior patent specification, substantially fills the gap. l u A main object of the'present invention is tonprovide a'V capping piece covering `tlie means for securing theends ofthe sheet within the gap, constructed sdl that when 'fixed in position, ,A it completely :fills the mouth ofthe gap, whereby a continuouscylindrical periphery tothe cylinder is 0btained. y Another object is to provide means for securing both ends of the sheet within the gap, which is free to rock and adjust itself so as to compensate for Iany diiference in length of the ends of the sheet within the gap i Ap preferred construction of the present invention is illustrated by way of example in the accompanying Vdrawingggsein which :-V

Figs. 1, 2 and 3 are fragmentary sectional elevations through a printing cylinder ofl the kind having a gap illustrating successive steps employing the fixing means ac cording to thepresent inve-ntionused in the fixing of a sheet on a cylinder;

Figfl isa longitudinal elevation of a cylinder-partly in section, the sectonfbeing taken on a line corresponding to the Aline IV1V ofFig. 3;

Fig. -5 is a fragmentary elevation ofa capping piece included in the cons-truction shown in` Figs. 3 Mld 4; Q i' for" the leading end off the Fig.` (54 is a sectionon the linel Vle-VI of Fig,.5`; l u' Figs. 7 and 8` are side. elevation, and; plan respectively `of the temporary. fixingmeans A j sheet shown in use inJFig. l; and Y i :Figs 9-and 10 are side elevationand'plan respectively of` a dragused `for fixing, both ends ofthe sheet within the cylindergap, as indicated in Eig. 2. l Referi" ig first to- Figs.- l, 7' and 8y ofthe drawings', the leading end' 5l ofthe sheet is temporarily secured within 4the cylinder gap by hook members 35 conveniently two hook members only aref utilized, one at each. third of the distance along the gap. being' found preferable. Each of1 the hookmembers is secured toa bed plate l@ by a'fixingiv screw 3?; andeach comprises a lug 36' engaging intoslots `previously formedl in theiendw of '.theprinting sheet, Tlieseilng's 36 hook 'into the said slots7 securely *holding the leading end of thelsheet withinthe cylinder gap, while the sheet is being Wrapped around the cylinder. When the sheet has? been wrapped around the cylinder andthe free end t. is alsoy within the gap, as illustrated-nin Figi 2;, drags 3.8 are utilized. These ,arerin the form of a plate, as clearly'indi'cated in Figs. y9 andlO, each plate including a lug 39 and a lug 40.. lThe lugs 39, hook into slots' inthe leading end 5 of the sheet andthe lugs 40 hook into. slots in the free end 4; thereof, both ends of the sheet being slotted for the receptionof the lugs 39 and 40 before be: ing applied tothe cylinder.

The drags are securedto the bed 'plate` 10 by fixing screws lllythe bed-plate'ihavinga series 'of borings for the" reception ofthe screws'lll and 3'?.` As the screws 37 and 41 are similar the screwstl can subsequently be substituted in the'borings taken up. by the screws 37 holding the temporary'hoolr members-35,

f Having secured bothA ends of `the sheet within the gap a; plurality'of drags 38 and the two hook members 35, the latter are 4 removed and substituted by drags, (In

vFig` the dot andpick lines indicate the that a pivotal'connection.isvprovided'between A the drags nand, :their respective securing means. To this end yeach drag `plate is formed with a. cup on its upper-surface, as indicated at 42 in Figs. 2, 9 `and 10, and a convex underside 43 to thehead of each fixing screw 41 is ormed'to correspond to the cupping on the drag so "as to ride smoothly therein, the drag plate beingrbored so as to provide a `clearance aroundthe fixing screw 41 and permit desired..play between them if there is a relative motion between the drag and the head ofthescrew during fixing the ends of the sheet, due to one end being longer than the other within the gap of the cylinder'. This arrangement, 'in nature a floating anchorage tor the ends of the printing sheet, thereforey permits the drag member to rock .freely and thereby compensate for any difference in.I the length of the" ends ofthe 'sheet within thegap..

In order to fill up the mouth of the gap andy cover the drags a' single capping piece is employed. It will be noted that the walls of the gap incline towards each other and give the gap a tapered form. Accordingly, the Acapping piece also is .of taperedl form corresponding to the shape of the gap.

The capping piece rests'on the bed plate 10 and is provided with arches 44 on its underside which bridge Lover all'the drags so as not to interfere with their function,

and is lixed in position by .screws 45 which vengage into tappingsl made in the bed plate 10 betweenthe tappingsfor the reception of the fixing screwsv 41 ofthe drags.y The top part of the capping piece is of convex form' conforming with the radius ofk the cylinder and is bored'at `intervals from the top radially of the cylinder f'orthe reception of its screws 45, the borings'beingsuch as to deeply c'ountersink the headsof the fixing screws and extending at a yreduced diameter from the seating of the screw heads to the gap for the reception of the shanks of the fixing screws. Each side of the capping piece is rabbeted, as indicated at 46, for the reception of compressible ,"paclcing strips, termed laces, indicated at 47, which provide continuity between .the periphery of the cylinder. Iand the convex face of the capping piece.l yAs indicated," each 'rabbeted portion of the capping pieceo-f the undercut form, that is, sor that the innermost partis of greater depth i than"that'4 at vthe periphery of the cylinder. With such an arrangement the compressible packing strips are alsol of tapered form, so that as the capping piece is drawn into the gap the laces are wedged'into position,.a.nd any-foutstand ing .or proud porti-ons can Vbe trimmed off.

Eachside of the gap near Vtheperiphery of the cylinder, that is, at the mouth'of the gap, vis preferably recessed, asfindicated at 50, they recessesbeing disposed so as TYto be partly overlapped by the' rabbets "fori the purpose ofallowing arlittle givein the'sheet `drical periphery `substituted therefor.

v 'Both the constructions hereinbefore described provide for lodging the compressible packing strips between KVthe sides of the capping piece and the walls of the gap, the nature of the lodgement being such that as the capping piece is ydrawn into position by its fixing screws, the strips are compressed between thesides of the capping piece and the walls of the gap, and-a continuous cylinof the cylinder is thereby obtained. 1

` In' order that the borings receiving the heads of the xing screws 45 shall not` disturb the continuity kof the outer surface of the cylinder, the space between the head of the bolt and the convex face` of the capping piece is filled with a plug 48 of suitable material, suchwas zcompressedfibre, .the part of the boring above the head of the screws 45 being tapped, and ,the plug-being .ex-y ternally Vthreaded to be screwed into position,A theplug having twov recesses 49 (Fig. 3)', in which thevpins ofia pin Spanner may engagef Both the screws 37` and 41 may have a convex slot, as clearly'indicated in the screws 41 in Fig. 2, sok as to provide ample room for a key spanner to kturn these members ywithin the gap. f f

In the construction herein described the use of a bedr platev 10 is referred to'.y .'Ob.- viously the actual bed of the gap may be bored to receive theseveral: fixing screws and thevterm lixed to the bed ofy 'the gap?? used in the present specification is intended M n to coverlsuch construction.

In utilizing'hook members" 35 and drags 88 as hereinbefore described a novel method of' securing the ends of ra printingfsheet; within the gap of the cylinder is obtained which consists in temporarily anchoring the leading end and drawing the free end into the gap kby 'drag members .which engage both ends of the sheet, the drag members being mounted to compensate for any difference of length of 'the endsofthe sheet within the gap as they aresecured tothe bedjof the gap, the temporary means-aforesaid being then removed and individual drag members I-claim;'- l f l 1. Aprinting cylinder having a gap,means Jfor securing-within the gap the kendsof a sheet when wrapped4 around; the cylinder, a capping piece .disposed over the securing means -to substantially lill .theV gap, compre'ssible packingy strips lodged between y each side of the capping piece and the walls of the gap,-and vmeans for securing said "cappingpiece in said.- gap operatingv todraw the capping piece into the gapwher'eon the packing strips are compressed between the sides of the capping piece and the walls of the gap', and a continuous cylindrical peri'pliery iior the cylinder thereby obtained.-

2. A printing cylinder' having i a gap, means for securing within the gap the ends oli a sheet when wrapped around the cylinder, a capping piece disposable over the securing i'neans to substantially iilli the gap, said capping piece including rabbeted sides, con'ipressible packing strips arra-nged insaid rabbets, and means for securing said capping piece in saidl gap operating to draw the capping piece into the gap, whereon-y the pack-ing strips are coi-npressed' between the sides of the` capping piece and the walls of the gap,- a-ndy a continuous cylindrical' periphery for the cylinder thereby obtained:

8. A printing cylinder having` al gap, the wallsofwhich incline towar'dseach other to give the gap a tapered form, means t'or securing within the gap the ends of a sheet when wrapped around the cylinder, a capping piece of tapered form corresponding to the shape of the gap, disposed over the capping piece to substantially fill the gap, rabbets on the sides of the capping piece, compressible packing strips arranged in the rabbets, and means for securing said capping piece in said gap operating to draw the capping piece into the gap, whereon the packing strips are compressed between the sides of the capping piece and the walls of the gap, and a continuous cylindrical periphery for the cylinder thereby obtained.

it. A printing cylinder having a gap, the walls of which incline towards each other to give the gap a. tapered form, means for securing within the gap the ends of a sheet when wrapped around the cylinder, a capping piece oi tapered form corresponding to the shape of the gap, disposed over the capping piece to substantially lill the gap, undercut rabbets on the sides of the capping piece formed so that the innermost part is of greater depth than that at the periphery ot' the cylinder, tapered compressible packing strips arranged in the rabbets, and means for securing said capping piece in said gap operating to draw lthe capping piece into the gap, whereon the packing strips are wedged up and compressed between the sides of the capping piece and the walls of the gap, and a continuous cylindrical periphery for the cylinder thereby obtained.

5. A printing cylinder having a gap, the walls of which incline towards each other to give the gap a tapered form and are each recessed near the mouth of the gap, means for securing within the gap the ends of a sheet when wrapped around the cylinder, aV

capping piece of tapered form corresponding to the shape of the gap, disposed over the capping piece to substantially fill the gap, undercut rabbets on the sides of the capping piece partly overlapping the recesses the walls of the gap and formed so that the innermost part is of greater depth thanthat `at the periphery of the cylinder, tapered compressi'ble packing strips arranged in the rabbets, andf means for securing said capping piece in said gap operating to draw theV capping piece; into the gap, whereon the packing strips are wedged up and compressed between the sides of the capping piece and the walls of the gap, and a continuous cylindrical periphery for' the cylinder thereby obtained, the sheet being permitted to yield over the said recesses, thereby allowing lateral spreading of the packings which assures their retention during printing operations.

.6. A printing cylinder' having a' gap, the walls of which incline towards each other to give the gap a tapered form and are each recessed near` the mouth of the gap, means 'for securing within the gap the ends of a sheet when wrapped around the cylinder, a capping piece oftapered form corresponding to the shape of the gap disposed over the capping piece to substantially fill the gap, undercut rabbets on the sides of the capping piece partly overlapping the recesses in the walls of the gap and formed so that the innermost partis of greater depth than that at the periphery of the cylinder, tapered compressible packing strips arranged in the rabbets, said capping piece being bored at intervals from the top radially to the cylinder to deeply countersink heads of fixing i screws, each boring extending at a reduced diameter through the capping piece for the reception of the Shanks or' the Xing screws, which enter the bed of the gap, and'plugs screwing snugly into the first mentioned borings to cover the countersunk screw heads and complete the cylindrical periphery of the cylinder.

7. A printing cylinder having a gap, a plurality of drags disposable in the gap formed to hook into each slotted end therein of a sheet wrapped around the cylinder, means for securing each drag tothe bed of the gap providing a pivotal connection bel tween the drags and securing means, whereby each drag member is free to rock Vand thereby compensate for any difference in the length of the ends of a sheet within the gap, a capping piece disposed over the drags to substantially fill the gap, compressible packing strips lodged between each side of the capping piece and the walls of the gap, and means fori securing said capping piece in said gap operating to draw the capping piece into the gap whereon the packing strips are compressed between the sides of the capping piece and the lwalls of the gap, and a continuous cylindrical pe-4 riphery for the cylinderthereby obtained.

llO

for securing each drag to the bed of the cylinder, a convex underside to thehead of the screw formed tocorrespond to the cup'ping on the drag, a capping piece disposed over the drags to substantially fill the gap, coinpressible packing strips lodged between each side of the capping piece and the .walls of the gap, and means or securing said capping piece in said gap operating to draw the capping piece into the gap whereon the packing strips are compressed between the sides of the capping piece and the walls of the gap, and a continuous cylindrical periphery for the cylinder thereby obtained. Y .Y

9. A printing cylinder having a gap, a

pluralityofv drags disposable in the gap formed to hook into each slotted end therein ofV a sheet wrapped around the cylinder, means for securing each drag to the bed of the gap providing a pivotal connection between the drags and securing means, wherebyeach drag member is free to rock and thereby compensate for any dierence in the length ofthe ends of a sheet within the gap. b l0. A printing cylinder having a. gap, a

plurality of drags disposable on the gap formed to hook into each slotted end therein of a sheet wrapped around the cylinder, a cup in the upper face of each drag, a screw for securing each drag to the bed of the cylinder, a convex underside to the head of the screw formed to correspond to the capping on the drag. y

In ltestimony whereof I aix my signature.

MALCOLM OWEN. 

